Alhamdulillah baby okay and heartbeat strong, that's the most important thing, sayang! A few of my mum friends experienced spotting around that time and their doctors also said hormonal changes je, and they all went on to have healthy pregnancies and deliveries. Spotting ni memang scary when you see it, tapi since your scan is clear and Dr has checked, try to take it as a good sign lah. If it continues or gets heavier, follow up with your doctor again, better safe than sorry. Hang in there, most second trimester spotting is nothing serious, okay?